local opt = vim.opt
local g = vim.g
local keyset = vim.keymap.set

opt.backup = false
opt.writebackup = false
opt.updatetime = 300
opt.signcolumn = "yes"

function _G.check_back_space()
    local col = vim.fn.col('.') - 1
    return col == 0 or vim.fn.getline('.'):sub(col, col):match('%s')
end

local opts = {silent = true, noremap = true, expr = true}
keyset("i", "<TAB>", 'coc#pum#visible() ? coc#pum#next(1) : v:lua.check_back_space() ? "<TAB>" : coc#refresh()', opts)
keyset("i", "<S-TAB>", [[coc#pum#visible() ? coc#pum#prev(1) : "\<C-h>"]], opts)
keyset("i", "<cr>", [[coc#pum#visible() ? coc#pum#confirm() : "\<C-g>u\<CR>\<c-r>=coc#on_enter()\<CR>"]], opts)


keyset("n", "gd", "<Plug>(coc-definition)", {silent = true})
keyset("n", "gy", "<Plug>(coc-type-definition)", {silent = true})
keyset("n", "gi", "<Plug>(coc-implementation)", {silent = true})
keyset("n", "gr", "<Plug>(coc-references)", {silent = true})

function _G.show_docs()
    local cw = vim.fn.expand('<cword>')
    if vim.fn.index({'vim', 'help'}, vim.bo.filetype) >= 0 then
        vim.api.nvim_command('h ' .. cw)
    elseif vim.api.nvim_eval('coc#rpc#ready()') then
        vim.fn.CocActionAsync('doHover')
    else
        vim.api.nvim_command('!' .. vim.o.keywordprg .. ' ' .. cw)
    end
end
keyset("n", "K", '<CMD>lua _G.show_docs()<CR>', {silent = true})



vim.cmd [[
    syntax on
    set scrolloff=4
    set nocompatible
    set encoding=utf-8
    set fileencoding=utf-8

    set smartindent
    set autoindent
    set number
    set relativenumber

    colorscheme onedarker
]]


require("nvim-tree").setup()
local builtin = require('telescope.builtin')
vim.keymap.set('n', 'ff', builtin.find_files, {})
vim.keymap.set('n', 'fg', builtin.live_grep, {})
vim.keymap.set('n', 'fb', builtin.buffers, {})
vim.keymap.set('n', 'fh', builtin.help_tags, {})

require'nvim-web-devicons'.setup()

vim.opt.termguicolors = true
require("bufferline").setup{}

require('colorizer').setup()

-- Treesitter settings
require'nvim-treesitter.configs'.setup {
    ensure_installed = "", -- one of "all", "maintained" (parsers with maintainers), or a list of languages
    highlight = {
        enable = true
    },
}